I read some saying that system time file is stored at BOIS, not at Harddisk, is this true ?

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That's true. All the shadow products I've tried so far don't protect against system time changes.

It'd be horribly annoying if they did, though, since then your system clock would be reset to an incorrect time every time you exit shadow mode. If you're worried about malware that fiddles with your clock, you can edit your group policies and remove privileges for this, or simpler, use a limited account.

I download that and extract. Then I start 360TimeProt.exe. There are 2 option and if I understand correctly left side button is activate and right side deactivate. Now I only need to know what those options are?

I download that and extract. Then I start 360TimeProt.exe. There are 2 option and if I understand correctly left side button is activate and right side deactivate. Now I only need to know what those options are?

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There are 4 buttons in the main GUI like this:

1)Install the Time Protect - 2)Uninstall the Time Protect
3)Enable the Time Protect - 4)Disable the Time protect